Elevator.



"R. F. EDMOND & P. o. NORELL.

ELEVATOR.

APPLICATION FILED SEPT. 7, 1910.

Patented Dec. 5, 1911.

6 u yszvrons UNITED STATES PATENT OFFICE.

ROBERT F. EDMOND, 0F WINNIPEG, CANADA, AND FRED O. NORELL, OF DULUTH, MINNESOTA.

ELEVATOR.

Specification of Letters Patent.

Serial No. 580,815.

To all whom it may concern:

Be it known that we, ROBERT F. ED- MOND, a citizen of the United States, but residing in Winnipeg, Canada, and FRED O. NORELL, a citizen of the United States, residing at Duluth, in the county of St. Louis and State of Minnesota, have invented certain new and useful Improvements in Elevators, of which the following is a specification, reference being had therein to the accompanying drawings.

Our invention relates to improvements in elevators, and pertains more particularly to those used in conveying grain and the like.

The object of our invention is to provlde an endless conveyer of this character with means whereby the lower conveyer pulley in the lower end of the boot is automatically adjustable longitudinally of the boot, to keep the belt tight and straight.

Another object of our invention is to provide means whereby the shaft of the lower end of the pulley is adjusted vertically independent of the automatic adjusting means.

In the accompanying drawings-Figure 1 is a side elevation of the lower end of an elevator leg with our improved automatic adjusting means attached thereto. Fig. 2 is an end View of the same, showing a portion of the leg broken away. Fig. 3 is a vertical sectional view ofone end of the pulley shaft, showing our improved lubrieating means.

In an elevator conveyer of this character,

- the atmospheric conditions greatly change the length of the conveyer belt, the belt also is changed in length by the amount of work placed thereon. Therefore, it is 1mpossible to accurately adjust the belt to lts proper length by hand under these conditions.

Referring now to the drawings, 1 and 2 represent the vertical conveyer boxes of the elevator leg, they being united at their lower ends by the housing or boot 3, in which is rotatably mounted the lower belt pulley 4. The housing or boot 3 is p'r0 vided on opposite sides with openings 5 and in which vertically move the journal boxes 6 and 7, carrying the lower pulley shaft 8. The sides of the boot are provided with vertical guides 4, as will be hereinafter more fully described.

The journal boxes 6 and 7 are mounted in vertical frames 6 and 7 which are movable in the guides 4 carried by the sides of the boot. These frames 6 and 7 are preferably built up of angle bars and have their upper ends vertically slidable between suitable guides 9, 10, 11 and 12, which are attached to the conveyer boxes 1 and 2, by means of the angle bars 9. J ournaled within the outer ends of the guides 9, 10, 11 and 12 are suitable rollers or sheaves 13, 14:, 15 and 16, which are centrally grooved to straddle the projecting angle-irons of the frames 6 and 7, as shown in Fig. 1, at 17 As heretofore stated, the journal boxes 6 and 7 are vertically movable in the frames 6 and 7, and extending longitudinally of the frames 6 and 7' are rods 19 and 20. The lower ends of the rods are pivotally mounted within the journal boxes 6 and '7 and the upper end provided with wheels 21 and 22. The lower ends of the rods 19 and 20 are screwed through a nut 18 permanently secured to the frames 6 and 7, whereby the rotation of either rod raises or lowers that end of the shaft to which it is attached. By this structure it will be readily seen that the shaft may be leveled in order to keep the belt true within the conveyer boxes to cause it to run more evenly through the boot.

The frames 6 and 7 are connected adjacent their upper ends in any suitable manner, and said connections are provided with weights 23 and 24, said weights normally holding the frames 6 and 7 in their down ward position to keep the conveyer belt tight. Any shrinkage of the belt will raise the shaft 8 upward carrying with it the frames 6 and 7.

The end of the shaft 8 is provided with caps 25, which are readily secured to the outer face of the journal boxes 6 and 7, and having an annular groove within their inner faces which communicates with the point of contact between the shaft 8 and the journaled boxes 6 and 7, as clearly shown in Fig. 3, 0f the drawings. A grease cup 27 is attached to the cap in any convenient manner and'communicates with the groove 26 by means of a passage 27 whereby the grease is forced from the cup to the groove 26 and must pass over the bearing surface between the shaft and the journal boxes 6 and 7. The caps 25 are attached to the bearings 6 and 7 by means of a plurality of Patented Dec. 5, 1911.

, tion.

In order to limit the-upward and down ward movements of the frames 6 and 7 which carry the pulley-shaft 8, we provide a plate 30, having its upper and lower ends 31 and 32 turned outwardly, as clearly shown in Fig. 1. The guide 12 for the frames 6 and 7 extends across the outer face of the plate 30, and the outwardly turned ends 31 and 32 engage the plate and limit the upward and downward movements of the frames 6 and 7 This prevents any possibility of the pockets on the belt scraping the bottom of the boot when the pulley is at its lowest limit, or the pulley engaging the top of the boot when in its raised position.

Having thus described our invention, what we claim and desire to secure by Letters Patent is:

1. An elevator comprising a boot, a pulley therein, a shaft carried by the pulley and extending through the boot, journals carried by the outer ends of the shaft, vertically movable members surrounding the journals, and means for adjustably securing the journals in said vertically movable mem bers.

2. An elevator comprising a boot, a pulley therein, a shaft carried by the pulley and extending through the sides of the boot, a frame vertically adjustable adj acent the sides of'the boot, journal boxes vertically adjustable in said frame and in which the shaft is mounted and means for adjusting the journal boxes in the frame independent of the movement of said frame.

3. An elevator comprising a boot, a pulley therein, a shaft carried by the pulley and extending through the sides of the boot, a frame vertically adjustable adjacent the sides of the boot, journal boxes vertically adjustable in said frame and in which the shaft is mounted, means for adjusting the journal boxes in the frame independent of the movement of said frame, and means for limiting the upward and downward movement of said frame.

4. An elevator comprising conveyer boxes, a boot carried by the lower ends of said boxes, a pulley within the boot, a shaft secured to the pulley and extending out through the sides of the boot, a frame extending on each side of the boot in which the shaft is journaled, guides carried by the boxes for guiding the frame and means for adjusting the shaft vertically within the frame independent of the movement of the frame.

5. An elevator comprising conveyer boxes, a boot carried by the lower ends of the boxes, a pulley within the boot, a shaft carried by the pulley and extending out through ver tical slots in the sides of the boot, a guide carried by the boot adjacent each slot, a frame vertically movable in said guide and extending upwardly between the conveyer boxes, transverse bars connecting the conveyer boxes, rollers carried by the bars and engaging the vertically movable frame and means for adjusting the shaft within said frame independent of the movement thereof.

6. An elevator comprising conveyer boxes, a boot carried by the lower ends of said boxes, a pulley within said boot, a shaft carried by the pulley and extending out through the vertical slots in the sides of the boot, a vertical guide on each side of the boot, a frame vertically adjustable in said guides and extending upwardly between the conveyer boxes, transverse bars carried by the conveyer boxes, grooved rollers carried by the bars, and forming a guide for the vertical movable frame, weights removably secured to the upper end of the frame, ournal boxes vertically movable in said frame and adapted to receive the ends of the shaft, a rod extending from the upper end of the frame and passing through a screw-threaded portion of the frame, and rotatably mounted in the journal boxes, and a plate carried by the side of the vertically movable frame and having an outwardly extending upper and lower end adapted to engage one of the transverse bars to limit the upward and downward movement of the said frame.

In testimony whereof we aflix our signatures in presence of two witnesses.

ROBERT F. EDMOND. FRED O. NORELL. WVitnesses to the signature of Robert F. Edmond:

YV. H. MGKILLIUM, H. TOOLEY. Witnesses to the signature of Fred 0.

Norell H. V. GoFrIN, S. GEO. S'rnvnNs.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, .D. G. 

